Description of problem:
I was invoking meld as a git difftool using
`git difftool --dir-diff develop` and the git configuration for my system is 

[core]
  editor = vim
  attributesfile = ~/.gitattributes
[diff]
  tool = meld
[commit]
  gpgsign = true
[fetch]
  prune = true
[pull]
  rebase = true
[push]
  default = current

[diff "rspec"]
  xfuncname = "^[ \t]*((RSpec|describe|context|it|before|after|around|feature|scenario)[ \t].*)$"
[diff "javascript"]
  xfuncname = "^[\t ]*(constructor|public|private|protected).*$"
  wordRegex = "^[\t ]*(const|let|var)[^()]*=[\t ]*\\([^()]*\\)[\t ]*=>*$"

Version-Release number of selected component:
meld-3.21.0-9.fc36

Additional info:
reporter:       libreport-2.17.1
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-org.kde.konsole-a846c1b88b9f4d0d9c8e7efc6995e5d0.scope
cmdline:        /usr/bin/python3 /usr/bin/meld /tmp/git-difftool.fASuzC/left/ /tmp/git-difftool.fASuzC/right/
crash_function: _get_pixbuf
exception_type: gi.repository.GLib.GError
executable:     /usr/bin/meld
interpreter:    python3-3.10.4-1.fc36.x86_64
kernel:         5.17.13-300.fc36.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
emblemcellrenderer.py:64:_get_pixbuf:gi.repository.GLib.GError: gtk-icon-theme-error-quark: Icon 'emblem-new' not present in theme breeze-dark (0)

Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/meld/ui/emblemcellrenderer.py", line 100, in do_render
    pixbuf = self._get_pixbuf(self.emblem_name, self._emblem_size)
  File "/usr/lib/python3.10/site-packages/meld/ui/emblemcellrenderer.py", line 64, in _get_pixbuf
    pixbuf = icon_theme.load_icon(name, size, 0).copy()
gi.repository.GLib.GError: gtk-icon-theme-error-quark: Icon 'emblem-new' not present in theme breeze-dark (0)

Local variables in innermost frame:
self: <emblemcellrenderer.EmblemCellRenderer object at 0x7f63e9a62a40 (EmblemCellRenderer at 0x556559fcf680)>
name: 'emblem-new'
size: 8
icon_theme: <Gtk.IconTheme object at 0x7f63e839f240 (GtkIconTheme at 0x556559692410)>